A slump in the trench: Tracking the impact of the 2011 Tohoku-Oki earthquake

M. Strasser, M. Kölling, C. dos Santos Ferreira, H.G. Fink, T. Fujiwara, S. Henkel, K. Ikehara, T. Kanamatsu, K. Kawamura, S. Kodaira, M. Römer, G. Wefer, R/V Sonne Cruise SO219A, JAMSTEC Cruise MR12-E01 scientists

研究成果: Contribution to journalArticle査読

抄録

We present differential bathymetry and sediment core data from the Japan Trench, sampled after the 2011 Tohoku-Oki (offshore Japan) earthquake to document that prominent bathymetric and structural changes along the trench axis relate to a large (∼27.7 km2) slump in the trench. Transient geochemical signals in the slump deposit and analysis of diffusive re-equilibration of disturbed SO42– profiles over time constrain the triggering of the slump to the 2011 earthquake. We propose a causal link between earthquake slip to the trench and rotational slumping above a subducting horst structure. We conclude that the earthquake-triggered slump is a leading agent for accretion of trench sediments into the forearc and hypothesize that forward growth of the prism and seaward advance of the deformation front by more than 2 km can occur, episodically, during a single-event, large mega-thrust earthquake.
本文言語未定義
ページ(範囲)935-938
ページ数4
ジャーナルGeology
41
8
DOI
出版ステータス出版済み - 8 1 2013

引用スタイル